Once you've downloaded a build, please read the Getting Started with SmartOS guide for information on getting up to speed quickly and refer to one of the following pages applicable to your preferred installation type:

Understanding SmartOS Builds

There is a new build, on average, every 2 weeks. SmartOS builds do not have a version number, rather they have a timestamp in the form: 20120809T221258Z (in this example, the date is: 08/09/2012 at 22:12:58 UTC)

For any given build, there will be 5 files available:

platform-(timestamp).tgz: The raw kernel and boot_archive; this is most commonly used for PXE booting